Kinetic Theory And Forces Between Particles

Question 0

Give the 3 properties of liquids

Answer 0

1. Some force between particles. Move past each other but tend to stick together.
2. Don’t keep definite shape but keep same volume - flow
3. Constantly moving, random motion. Hotter get faster move + slightly expand

Question 1

Describe properties of solids - 3

Answer 1

1. Strong forces hold particles in fixed position - regular lattice arrangement
2. Definite shape and volume
3. Particles vibrate. Hotter solid becomes, more vibrate, solid expands

Question 2

Describe the 3 properties of gases

Answer 2

1. No force of attraction - particles move freely in straight lines and only interact when they collide
2. Don’t keep shape or volume - fill containers and exert a pressure when bounce off sides
3. Constant random motion. Hotter gas faster move. Expand when heated or pressure increased.

Question 3

How do we smell? 3 steps

Answer 3

1. Liquid heated, particles move faster
2. Some particles move faster
3. Fast particles at surface overcome force of attraction and escape - evaporation

Question 4

What is volatility?

Answer 4

How easily liquid evaporates

Question 5

Why is a perfume volatile?

Answer 5

Evaporate quickly to give smell. Have weak attraction.